Join Date: Nov 2013
Location: Richfield, WI
Bikes: Trek Domane 5.2, Trek ION, Trek Crockert, Cannondale F29, Supercross Extension II
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I bought a Trek cyclocross bike this past summer (Trek ION) for riding gravel trails and I love it. I wanted the bike to be fast, yet comfortable, and riding my mountain bike on gravel trails was neither. I'd say you can't go wrong with either of the bikes you posted.
Since primary use will be road riding, you may consider purchasing a second set of wheels (someday). When you know you're going to be road riding only, like in a century, have on set of wheels with slick, narrower tires (25mm?) mounted. Then use your other set when you think you might be traveling over gravel. That will kind of give you the "best of both worlds" w/o having to buy two bikes.
BTW, I got my bike on eBay for a great price... $1,500 for a custom build, Ultegra 10-speed equipped bike. You might consider looking there for a cyclecross bike as they show-up quite often.